<!DOCTYPE html>
<html lang='en'>

<head>
    <meta charset='UTF-8'>
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
    <meta http-equiv='X-UA-Compatible' content='ie=edge'>
    <title>Document</title>
    <style type="text/css">
        /* .container {} */

        .container .cart {
            width: 300px;
            margin: auto;
        }

        .container .title {
            background-color: lightblue;
            height: 40px;
            line-height: 40px;
            text-align: center;
            /*color: #fff;*/
        }

        .container .total {
            background-color: #FFCE46;
            height: 50px;
            line-height: 50px;
            text-align: right;
        }

        .container .total button {
            margin: 0 10px;
            background-color: #DC4C40;
            height: 35px;
            width: 80px;
            border: 0;
        }

        .container .total span {
            color: red;
            font-weight: bold;
        }

        .container .item {
            height: 55px;
            line-height: 55px;
            position: relative;
            border-top: 1px solid #ADD8E6;
        }

        .container .item img {
            width: 45px;
            height: 45px;
            margin: 5px;
        }

        .container .item .name {
            position: absolute;
            width: 90px;
            top: 0;
            left: 55px;
            font-size: 16px;
        }

        .container .item .change {
            width: 100px;
            position: absolute;
            top: 0;
            right: 50px;
        }

        .container .item .change a {
            font-size: 20px;
            width: 30px;
            text-decoration: none;
            background-color: lightgray;
            vertical-align: middle;
        }

        .container .item .change .num {
            width: 40px;
            height: 25px;
        }

        .container .item .del {
            position: absolute;
            top: 0;
            right: 0px;
            width: 40px;
            text-align: center;
            font-size: 40px;
            cursor: pointer;
            color: red;
        }

        .container .item .del:hover {
            background-color: orange;
        }
    </style>
</head>

<body>
    <div id='app'>
        <shop-car></shop-car>
    </div>
    <script src='https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js'></script>
    <script>
        // 标题组件
        const cartTitle = {
            props: ['uname'],
            template: `<div class="title">{{uname}}的商品</div>`
        }
        // 列表组件
        const cartList = {
            props: ['cartlist'],
            template: `  <div>
                            <div class="item" v-for="item in cartlist" :key="item.id">
                                <img :src="item.img" />
                                <div class="name">{{item.name}}</div>
                                <div class="change">
                                <a href="" @click.prevent="subItem(item.id)">－</a> 
                                <input type="text" class="num" :value="item.num" @change="changeItem(item.id,$event)" />
                                <a href="" @click.prevent="addItem(item.id)">＋</a>
                                </div>
                                <div class="del" @click="delItem(item.id)">×</div>
                            </div>
                        </div>`,
            methods: {
                delItem(id) {
                    // this.$emit('自定义事件名', 参数)
                    this.$emit('remove', id)
                },
                // 增加商品
                addItem(id) {
                    this.$emit('add', {
                        id: id,
                        flag: 'add'
                    })
                },
                // 减少商品
                subItem(id) {
                    this.$emit('add', {
                        id: id,
                        flag: 'sub'
                    })
                },
                //手动修改商品数量
                changeItem(id, event) {
                    // console.log(event.target.value);  // 手动输入的数据

                    if (!Number(event.target.value)) {
                        return event.target.value = 1
                    }
                    this.$emit('add', {
                        id: id,
                        val: event.target.value - 0,
                        flag: 'change'
                    })
                }

            }
        }
        // 结算组件
        const cartTotal = {
            props: ['cartlist'],
            template: `<div class="total"><span>总价：{{sum}}</span> <button>结算</button></div>`,
            computed: {
                sum() {
                    let total = 0
                    this.cartlist.forEach(item => {
                        total += item.num * item.price
                    })
                    return total
                }
            }
        }

        // 购物车组件
        Vue.component('shop-car', {
            template: `
            <div class="container">
                <div class="cart">
                    
                    <cart-title :uname="uname"></cart-title>
                   
                    <cart-list :cartlist="list" @remove="handleDel($event)" @add="handleAdd($event)"></cart-list>
                 
                    <cart-total :cartlist="list"></cart-total>
                </div>
            </div>
            `,
            components: {
                'cart-title': cartTitle,
                'cart-list': cartList,
                'cart-total': cartTotal
            },
            data() {
                return {
                    uname: '张三',
                    list: [{
                        id: 1,
                        name: 'TCL彩电',
                        price: 1000,
                        num: 1,
                        img: 'img/a.jpg'
                    }, {
                        id: 2,
                        name: '机顶盒',
                        price: 1000,
                        num: 1,
                        img: 'img/b.jpg'
                    }, {
                        id: 3,
                        name: '海尔冰箱',
                        price: 1000,
                        num: 1,
                        img: 'img/c.jpg'
                    }, {
                        id: 4,
                        name: '小米手机',
                        price: 1000,
                        num: 1,
                        img: 'img/d.jpg'
                    }, {
                        id: 5,
                        name: 'PPTV电视',
                        price: 1000,
                        num: 2,
                        img: 'img/e.jpg'
                    }]
                }
            },
            methods: {
                handleDel(id) {
                    // 方法一  拿着id找索引,截取数组就可以
                    const index = this.list.findIndex(item => item.id == id)
                    console.log(index);
                    var res = this.list.splice(index, 1)
                    console.log(res);

                    // 方法二  过滤
                    // this.list = this.list.filter(item => item.id != id)
                },
                handleAdd(obj) {
                    console.log(obj);
                    // 拿着id 数组中找到对应的索引
                    const index = this.list.findIndex(item => item.id == obj.id)

                    // 让对应的索引项的num 自增+1
                    console.log(this.list[index].num); // 对应数组项的商品的数量

                    if (obj.flag == 'add') {
                        this.list[index].num++
                    } else if (obj.flag == 'sub') {
                        if (this.list[index].num <= 1) return;
                        this.list[index].num--
                    } else if (obj.flag == 'change') {
                        this.list[index].num = obj.val
                    }
                }
            }
        })

        const vm = new Vue({
            el: '#app',
            data: {},
            methods: {},
        })
    </script>
</body>

</html>